[deliverable/linux.git] / drivers / staging / lustre / lustre / llite / llite_nfs.c

/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2012, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lustre/lustre/llite/llite_nfs.c
 *
 * NFS export of Lustre Light File System
 *
 * Author: Yury Umanets <umka@clusterfs.com>
 * Author: Huang Hua <huanghua@clusterfs.com>
 */

#define DEBUG_SUBSYSTEM S_LLITE
#include "../include/lustre_lite.h"
#include "llite_internal.h"
#include <linux/exportfs.h>

__u32 get_uuid2int(const char *name, int len)
{
	__u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;

	while (len--) {
		__u32 key = key1 + (key0 ^ (*name++ * 7152373));

		if (key & 0x80000000)
			key -= 0x7fffffff;
		key1 = key0;
		key0 = key;
	}
	return (key0 << 1);
}

void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid)
{
	__u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9;

	while (len--) {
		key = key1 + (key0 ^ (*name++ * 7152373));
		if (key & 0x8000000000000000ULL)
			key -= 0x7fffffffffffffffULL;
		key1 = key0;
		key0 = key;
	}

	fsid->val[0] = key;
	fsid->val[1] = key >> 32;
}

struct inode *search_inode_for_lustre(struct super_block *sb,
				      const struct lu_fid *fid)
{
	struct ll_sb_info     *sbi = ll_s2sbi(sb);
	struct ptlrpc_request *req = NULL;
	struct inode	  *inode = NULL;
	int		   eadatalen = 0;
	unsigned long	      hash = cl_fid_build_ino(fid,
						      ll_need_32bit_api(sbi));
	struct  md_op_data    *op_data;
	int		   rc;

	CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));

	inode = ilookup5(sb, hash, ll_test_inode_by_fid, (void *)fid);
	if (inode)
		return inode;

	rc = ll_get_default_mdsize(sbi, &eadatalen);
	if (rc)
		return ERR_PTR(rc);

	/* Because inode is NULL, ll_prep_md_op_data can not
	 * be used here. So we allocate op_data ourselves
	 */
	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
	if (!op_data)
		return ERR_PTR(-ENOMEM);

	op_data->op_fid1 = *fid;
	op_data->op_mode = eadatalen;
	op_data->op_valid = OBD_MD_FLEASIZE;

	/* mds_fid2dentry ignores f_type */
	rc = md_getattr(sbi->ll_md_exp, op_data, &req);
	kfree(op_data);
	if (rc) {
		CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
		       PFID(fid), rc);
		return ERR_PTR(rc);
	}
	rc = ll_prep_inode(&inode, req, sb, NULL);
	ptlrpc_req_finished(req);
	if (rc)
		return ERR_PTR(rc);

	return inode;
}

struct lustre_nfs_fid {
	struct lu_fid   lnf_child;
	struct lu_fid   lnf_parent;
};

static struct dentry *
ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *parent)
{
	struct inode  *inode;
	struct dentry *result;

	if (!fid_is_sane(fid))
		return ERR_PTR(-ESTALE);

	CDEBUG(D_INFO, "Get dentry for fid: " DFID "\n", PFID(fid));

	inode = search_inode_for_lustre(sb, fid);
	if (IS_ERR(inode))
		return ERR_CAST(inode);

	if (is_bad_inode(inode)) {
		/* we didn't find the right inode.. */
		iput(inode);
		return ERR_PTR(-ESTALE);
	}

	result = d_obtain_alias(inode);
	if (IS_ERR(result)) {
		iput(inode);
		return result;
	}

	/**
	 * In case d_obtain_alias() found a disconnected dentry, always update
	 * lli_pfid to allow later operation (normally open) have parent fid,
	 * which may be used by MDS to create data.
	 */
	if (parent) {
		struct ll_inode_info *lli = ll_i2info(inode);

		spin_lock(&lli->lli_lock);
		lli->lli_pfid = *parent;
		spin_unlock(&lli->lli_lock);
	}

	/* N.B. d_obtain_alias() drops inode ref on error */
	result = d_obtain_alias(inode);
	if (!IS_ERR(result)) {
		int rc;

		rc = ll_d_init(result);
		if (rc < 0) {
			dput(result);
			result = ERR_PTR(rc);
		} else {
			struct ll_dentry_data *ldd = ll_d2d(result);

			/*
			 * Need to signal to the ll_intent_file_open that
			 * we came from NFS and so opencache needs to be
			 * enabled for this one
			 */
			ldd->lld_nfs_dentry = 1;
		}
	}

	return result;
}

/**
 * \a connectable - is nfsd will connect himself or this should be done
 *		  at lustre
 *
 * The return value is file handle type:
 * 1 -- contains child file handle;
 * 2 -- contains child file handle and parent file handle;
 * 255 -- error.
 */
static int ll_encode_fh(struct inode *inode, __u32 *fh, int *plen,
			struct inode *parent)
{
	int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
	struct lustre_nfs_fid *nfs_fid = (void *)fh;

	CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
	       ll_get_fsname(inode->i_sb, NULL, 0),
	       PFID(ll_inode2fid(inode)), *plen, fileid_len);

	if (*plen < fileid_len) {
		*plen = fileid_len;
		return FILEID_INVALID;
	}

	nfs_fid->lnf_child = *ll_inode2fid(inode);
	if (parent)
		nfs_fid->lnf_parent = *ll_inode2fid(parent);
	else
		fid_zero(&nfs_fid->lnf_parent);
	*plen = fileid_len;

	return FILEID_LUSTRE;
}

static int ll_nfs_get_name_filldir(struct dir_context *ctx, const char *name,
				   int namelen, loff_t hash, u64 ino,
				   unsigned type)
{
	/* It is hack to access lde_fid for comparison with lgd_fid.
	 * So the input 'name' must be part of the 'lu_dirent'.
	 */
	struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
	struct ll_getname_data *lgd =
		container_of(ctx, struct ll_getname_data, ctx);
	struct lu_fid fid;

	fid_le_to_cpu(&fid, &lde->lde_fid);
	if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
		memcpy(lgd->lgd_name, name, namelen);
		lgd->lgd_name[namelen] = 0;
		lgd->lgd_found = 1;
	}
	return lgd->lgd_found;
}

static int ll_get_name(struct dentry *dentry, char *name,
		       struct dentry *child)
{
	struct inode *dir = d_inode(dentry);
	int rc;
	struct ll_getname_data lgd = {
		.lgd_name = name,
		.lgd_fid = ll_i2info(d_inode(child))->lli_fid,
		.ctx.actor = ll_nfs_get_name_filldir,
	};
	struct md_op_data *op_data;
	__u64 pos = 0;

	if (!dir || !S_ISDIR(dir->i_mode)) {
		rc = -ENOTDIR;
		goto out;
	}

	if (!dir->i_fop) {
		rc = -EINVAL;
		goto out;
	}

	op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
				     LUSTRE_OPC_ANY, dir);
	if (IS_ERR(op_data)) {
		rc = PTR_ERR(op_data);
		goto out;
	}

	op_data->op_max_pages = ll_i2sbi(dir)->ll_md_brw_pages;
	inode_lock(dir);
	rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx);
	inode_unlock(dir);
	ll_finish_md_op_data(op_data);
	if (!rc && !lgd.lgd_found)
		rc = -ENOENT;
out:
	return rc;
}

static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
				      int fh_len, int fh_type)
{
	struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;

	if (fh_type != FILEID_LUSTRE)
		return ERR_PTR(-EPROTO);

	return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent);
}

static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
				      int fh_len, int fh_type)
{
	struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;

	if (fh_type != FILEID_LUSTRE)
		return ERR_PTR(-EPROTO);

	return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);
}

int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
{
	struct ptlrpc_request *req = NULL;
	struct ll_sb_info     *sbi;
	struct mdt_body       *body;
	static const char dotdot[] = "..";
	struct md_op_data     *op_data;
	int		   rc;
	int		      lmmsize;

	LASSERT(dir && S_ISDIR(dir->i_mode));

	sbi = ll_s2sbi(dir->i_sb);

	CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
	       ll_get_fsname(dir->i_sb, NULL, 0),
	       PFID(ll_inode2fid(dir)));

	rc = ll_get_default_mdsize(sbi, &lmmsize);
	if (rc != 0)
		return rc;

	op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
				     strlen(dotdot), lmmsize,
				     LUSTRE_OPC_ANY, NULL);
	if (IS_ERR(op_data))
		return PTR_ERR(op_data);

	rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
	ll_finish_md_op_data(op_data);
	if (rc) {
		CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
		       ll_get_fsname(dir->i_sb, NULL, 0),
		       PFID(ll_inode2fid(dir)), rc);
		return rc;
	}
	body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
	/*
	 * LU-3952: MDT may lost the FID of its parent, we should not crash
	 * the NFS server, ll_iget_for_nfs() will handle the error.
	 */
	if (body->mbo_valid & OBD_MD_FLID) {
		CDEBUG(D_INFO, "parent for " DFID " is " DFID "\n",
		       PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
		*parent_fid = body->mbo_fid1;
	}

	ptlrpc_req_finished(req);
	return 0;
}

static struct dentry *ll_get_parent(struct dentry *dchild)
{
	struct lu_fid parent_fid = { 0 };
	struct dentry *dentry;
	int rc;

	rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
	if (rc)
		return ERR_PTR(rc);

	dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);

	return dentry;
}

const struct export_operations lustre_export_operations = {
	.get_parent = ll_get_parent,
	.encode_fh  = ll_encode_fh,
	.get_name   = ll_get_name,
	.fh_to_dentry = ll_fh_to_dentry,
	.fh_to_parent = ll_fh_to_parent,
};
Commit	Line	Data
d7e09d03 PT	1	/*
	2	* GPL HEADER START
	3	*
	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 only,
	8	* as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License version 2 for more details (a copy is included
	14	* in the LICENSE file that accompanied this code).
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* version 2 along with this program; If not, see
6a5b99a4	18	* http://www.gnu.org/licenses/gpl-2.0.html
d7e09d03	19	*
d7e09d03 PT	20	* GPL HEADER END
	21	*/
	22	/*
	23	* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
	24	* Use is subject to license terms.
	25	*
	26	* Copyright (c) 2011, 2012, Intel Corporation.
	27	*/
	28	/*
	29	* This file is part of Lustre, http://www.lustre.org/
	30	* Lustre is a trademark of Sun Microsystems, Inc.
	31	*
	32	* lustre/lustre/llite/llite_nfs.c
	33	*
	34	* NFS export of Lustre Light File System
	35	*
	36	* Author: Yury Umanets <umka@clusterfs.com>
	37	* Author: Huang Hua <huanghua@clusterfs.com>
	38	*/
	39
	40	#define DEBUG_SUBSYSTEM S_LLITE
67a235f5	41	#include "../include/lustre_lite.h"
d7e09d03 PT	42	#include "llite_internal.h"
	43	#include <linux/exportfs.h>
	44
	45	__u32 get_uuid2int(const char *name, int len)
	46	{
	47	__u32 key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
50ffcb7e	48
d7e09d03 PT	49	while (len--) {
d7e09d03 PT	50	__u32 key = key1 + (key0 ^ (name++ 7152373));
5b39bd5f JP	51
	52	if (key & 0x80000000)
	53	key -= 0x7fffffff;
d7e09d03 PT	54	key1 = key0;
	55	key0 = key;
	56	}
	57	return (key0 << 1);
	58	}
	59
bd994071 FY	60	void get_uuid2fsid(const char name, int len, __kernel_fsid_t fsid)
	61	{
	62	__u64 key = 0, key0 = 0x12a3fe2d, key1 = 0x37abe8f9;
	63
	64	while (len--) {
	65	key = key1 + (key0 ^ (name++ 7152373));
	66	if (key & 0x8000000000000000ULL)
	67	key -= 0x7fffffffffffffffULL;
	68	key1 = key0;
	69	key0 = key;
	70	}
	71
	72	fsid->val[0] = key;
	73	fsid->val[1] = key >> 32;
	74	}
	75
d7e09d03 PT	76	struct inode search_inode_for_lustre(struct super_block sb,
	77	const struct lu_fid *fid)
	78	{
	79	struct ll_sb_info *sbi = ll_s2sbi(sb);
	80	struct ptlrpc_request *req = NULL;
	81	struct inode *inode = NULL;
	82	int eadatalen = 0;
	83	unsigned long hash = cl_fid_build_ino(fid,
	84	ll_need_32bit_api(sbi));
	85	struct md_op_data *op_data;
	86	int rc;
d7e09d03 PT	87
	88	CDEBUG(D_INFO, "searching inode for:(%lu,"DFID")\n", hash, PFID(fid));
	89
2de35386	90	inode = ilookup5(sb, hash, ll_test_inode_by_fid, (void *)fid);
d7e09d03	91	if (inode)
0a3bdb00	92	return inode;
d7e09d03	93
44779340	94	rc = ll_get_default_mdsize(sbi, &eadatalen);
d7e09d03	95	if (rc)
0a3bdb00	96	return ERR_PTR(rc);
d7e09d03 PT	97
d7e09d03 PT	98	/* Because inode is NULL, ll_prep_md_op_data can not
c0894c6c OD	99	* be used here. So we allocate op_data ourselves
c0894c6c OD	100	*/
496a51bd JL	101	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
496a51bd JL	102	if (!op_data)
d7e09d03 PT	103	return ERR_PTR(-ENOMEM);
	104
	105	op_data->op_fid1 = *fid;
	106	op_data->op_mode = eadatalen;
	107	op_data->op_valid = OBD_MD_FLEASIZE;
	108
	109	/* mds_fid2dentry ignores f_type */
	110	rc = md_getattr(sbi->ll_md_exp, op_data, &req);
97903a26	111	kfree(op_data);
d7e09d03	112	if (rc) {
ac7af34e	113	CDEBUG(D_INFO, "can't get object attrs, fid "DFID", rc %d\n",
d7e09d03	114	PFID(fid), rc);
0a3bdb00	115	return ERR_PTR(rc);
d7e09d03 PT	116	}
	117	rc = ll_prep_inode(&inode, req, sb, NULL);
	118	ptlrpc_req_finished(req);
	119	if (rc)
0a3bdb00	120	return ERR_PTR(rc);
d7e09d03	121
0a3bdb00	122	return inode;
d7e09d03 PT	123	}
	124
	125	struct lustre_nfs_fid {
	126	struct lu_fid lnf_child;
	127	struct lu_fid lnf_parent;
	128	};
	129
	130	static struct dentry *
	131	ll_iget_for_nfs(struct super_block sb, struct lu_fid fid, struct lu_fid *parent)
	132	{
	133	struct inode *inode;
	134	struct dentry *result;
d7e09d03	135
d7e09d03	136	if (!fid_is_sane(fid))
0a3bdb00	137	return ERR_PTR(-ESTALE);
d7e09d03	138
cb776592 DE	139	CDEBUG(D_INFO, "Get dentry for fid: " DFID "\n", PFID(fid));
cb776592 DE	140
d7e09d03 PT	141	inode = search_inode_for_lustre(sb, fid);
d7e09d03 PT	142	if (IS_ERR(inode))
0a3bdb00	143	return ERR_CAST(inode);
d7e09d03 PT	144
	145	if (is_bad_inode(inode)) {
	146	/* we didn't find the right inode.. */
	147	iput(inode);
0a3bdb00	148	return ERR_PTR(-ESTALE);
d7e09d03 PT	149	}
d7e09d03 PT	150
c1b66fcc LS	151	result = d_obtain_alias(inode);
	152	if (IS_ERR(result)) {
	153	iput(inode);
	154	return result;
	155	}
	156
d7e09d03	157	/**
c1b66fcc LS	158	* In case d_obtain_alias() found a disconnected dentry, always update
	159	* lli_pfid to allow later operation (normally open) have parent fid,
	160	* which may be used by MDS to create data.
d7e09d03	161	*/
c1b66fcc	162	if (parent) {
d7e09d03 PT	163	struct ll_inode_info *lli = ll_i2info(inode);
	164
	165	spin_lock(&lli->lli_lock);
	166	lli->lli_pfid = *parent;
	167	spin_unlock(&lli->lli_lock);
	168	}
	169
7f830d8d	170	/* N.B. d_obtain_alias() drops inode ref on error */
d7e09d03	171	result = d_obtain_alias(inode);
6dad4d89 OD	172	if (!IS_ERR(result)) {
	173	int rc;
	174
	175	rc = ll_d_init(result);
	176	if (rc < 0) {
	177	dput(result);
	178	result = ERR_PTR(rc);
	179	} else {
	180	struct ll_dentry_data *ldd = ll_d2d(result);
	181
	182	/*
	183	* Need to signal to the ll_intent_file_open that
	184	* we came from NFS and so opencache needs to be
	185	* enabled for this one
	186	*/
	187	ldd->lld_nfs_dentry = 1;
	188	}
	189	}
d7e09d03	190
0a3bdb00	191	return result;
d7e09d03 PT	192	}
d7e09d03 PT	193
d7e09d03 PT	194	/**
	195	* \a connectable - is nfsd will connect himself or this should be done
	196	* at lustre
	197	*
	198	* The return value is file handle type:
	199	* 1 -- contains child file handle;
	200	* 2 -- contains child file handle and parent file handle;
	201	* 255 -- error.
	202	*/
	203	static int ll_encode_fh(struct inode inode, __u32 fh, int *plen,
	204	struct inode *parent)
	205	{
cb776592	206	int fileid_len = sizeof(struct lustre_nfs_fid) / 4;
d7e09d03	207	struct lustre_nfs_fid nfs_fid = (void )fh;
d7e09d03	208
97a075cd JN	209	CDEBUG(D_INFO, "%s: encoding for ("DFID") maxlen=%d minlen=%d\n",
	210	ll_get_fsname(inode->i_sb, NULL, 0),
	211	PFID(ll_inode2fid(inode)), *plen, fileid_len);
d7e09d03	212
cb776592 DE	213	if (*plen < fileid_len) {
	214	*plen = fileid_len;
	215	return FILEID_INVALID;
	216	}
d7e09d03 PT	217
d7e09d03 PT	218	nfs_fid->lnf_child = *ll_inode2fid(inode);
cb776592 DE	219	if (parent)
	220	nfs_fid->lnf_parent = *ll_inode2fid(parent);
	221	else
	222	fid_zero(&nfs_fid->lnf_parent);
	223	*plen = fileid_len;
d7e09d03	224
cb776592	225	return FILEID_LUSTRE;
d7e09d03 PT	226	}
d7e09d03 PT	227
ac7576f4 MS	228	static int ll_nfs_get_name_filldir(struct dir_context ctx, const char name,
	229	int namelen, loff_t hash, u64 ino,
	230	unsigned type)
d7e09d03 PT	231	{
d7e09d03 PT	232	/* It is hack to access lde_fid for comparison with lgd_fid.
c0894c6c OD	233	* So the input 'name' must be part of the 'lu_dirent'.
c0894c6c OD	234	*/
d7e09d03	235	struct lu_dirent *lde = container_of0(name, struct lu_dirent, lde_name);
ac7576f4 MS	236	struct ll_getname_data *lgd =
ac7576f4 MS	237	container_of(ctx, struct ll_getname_data, ctx);
d7e09d03 PT	238	struct lu_fid fid;
	239
	240	fid_le_to_cpu(&fid, &lde->lde_fid);
	241	if (lu_fid_eq(&fid, &lgd->lgd_fid)) {
	242	memcpy(lgd->lgd_name, name, namelen);
	243	lgd->lgd_name[namelen] = 0;
	244	lgd->lgd_found = 1;
	245	}
	246	return lgd->lgd_found;
	247	}
	248
	249	static int ll_get_name(struct dentry dentry, char name,
	250	struct dentry *child)
	251	{
2b0143b5	252	struct inode *dir = d_inode(dentry);
d7e09d03	253	int rc;
0b09d381 PT	254	struct ll_getname_data lgd = {
0b09d381 PT	255	.lgd_name = name,
2b0143b5	256	.lgd_fid = ll_i2info(d_inode(child))->lli_fid,
0b09d381 PT	257	.ctx.actor = ll_nfs_get_name_filldir,
0b09d381 PT	258	};
307bef74	259	struct md_op_data *op_data;
218ba485	260	__u64 pos = 0;
d7e09d03	261
34e1f2bb JL	262	if (!dir \|\| !S_ISDIR(dir->i_mode)) {
	263	rc = -ENOTDIR;
	264	goto out;
	265	}
d7e09d03	266
34e1f2bb JL	267	if (!dir->i_fop) {
	268	rc = -EINVAL;
	269	goto out;
	270	}
d7e09d03	271
307bef74	272	op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
	273	LUSTRE_OPC_ANY, dir);
	274	if (IS_ERR(op_data)) {
	275	rc = PTR_ERR(op_data);
	276	goto out;
	277	}
	278
bce1bbf4	279	op_data->op_max_pages = ll_i2sbi(dir)->ll_md_brw_pages;
5955102c	280	inode_lock(dir);
218ba485	281	rc = ll_dir_read(dir, &pos, op_data, &lgd.ctx);
5955102c	282	inode_unlock(dir);
307bef74	283	ll_finish_md_op_data(op_data);
d7e09d03 PT	284	if (!rc && !lgd.lgd_found)
d7e09d03 PT	285	rc = -ENOENT;
d7e09d03 PT	286	out:
	287	return rc;
	288	}
	289
	290	static struct dentry ll_fh_to_dentry(struct super_block sb, struct fid *fid,
	291	int fh_len, int fh_type)
	292	{
	293	struct lustre_nfs_fid nfs_fid = (struct lustre_nfs_fid )fid;
	294
cb776592	295	if (fh_type != FILEID_LUSTRE)
0a3bdb00	296	return ERR_PTR(-EPROTO);
d7e09d03	297
0a3bdb00	298	return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent);
d7e09d03 PT	299	}
	300
	301	static struct dentry ll_fh_to_parent(struct super_block sb, struct fid *fid,
	302	int fh_len, int fh_type)
	303	{
	304	struct lustre_nfs_fid nfs_fid = (struct lustre_nfs_fid )fid;
	305
cb776592	306	if (fh_type != FILEID_LUSTRE)
0a3bdb00	307	return ERR_PTR(-EPROTO);
d7e09d03	308
0a3bdb00	309	return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);
d7e09d03 PT	310	}
d7e09d03 PT	311
ef21b1fb	312	int ll_dir_get_parent_fid(struct inode dir, struct lu_fid parent_fid)
d7e09d03 PT	313	{
d7e09d03 PT	314	struct ptlrpc_request *req = NULL;
d7e09d03	315	struct ll_sb_info *sbi;
d7e09d03	316	struct mdt_body *body;
ef21b1fb	317	static const char dotdot[] = "..";
d7e09d03 PT	318	struct md_op_data *op_data;
	319	int rc;
	320	int lmmsize;
d7e09d03 PT	321
	322	LASSERT(dir && S_ISDIR(dir->i_mode));
	323
	324	sbi = ll_s2sbi(dir->i_sb);
	325
97a075cd JN	326	CDEBUG(D_INFO, "%s: getting parent for ("DFID")\n",
	327	ll_get_fsname(dir->i_sb, NULL, 0),
	328	PFID(ll_inode2fid(dir)));
d7e09d03	329
44779340	330	rc = ll_get_default_mdsize(sbi, &lmmsize);
d7e09d03	331	if (rc != 0)
ef21b1fb	332	return rc;
d7e09d03 PT	333
	334	op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
	335	strlen(dotdot), lmmsize,
	336	LUSTRE_OPC_ANY, NULL);
	337	if (IS_ERR(op_data))
ef21b1fb	338	return PTR_ERR(op_data);
d7e09d03 PT	339
	340	rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
	341	ll_finish_md_op_data(op_data);
	342	if (rc) {
97a075cd JN	343	CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
	344	ll_get_fsname(dir->i_sb, NULL, 0),
	345	PFID(ll_inode2fid(dir)), rc);
ef21b1fb	346	return rc;
d7e09d03 PT	347	}
d7e09d03 PT	348	body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
1e5a6fa9 BJ	349	/*
	350	* LU-3952: MDT may lost the FID of its parent, we should not crash
	351	* the NFS server, ll_iget_for_nfs() will handle the error.
	352	*/
2e1b5b8b	353	if (body->mbo_valid & OBD_MD_FLID) {
1e5a6fa9	354	CDEBUG(D_INFO, "parent for " DFID " is " DFID "\n",
2e1b5b8b JH	355	PFID(ll_inode2fid(dir)), PFID(&body->mbo_fid1));
2e1b5b8b JH	356	*parent_fid = body->mbo_fid1;
1e5a6fa9	357	}
d7e09d03 PT	358
d7e09d03 PT	359	ptlrpc_req_finished(req);
ef21b1fb	360	return 0;
	361	}
	362
	363	static struct dentry ll_get_parent(struct dentry dchild)
	364	{
	365	struct lu_fid parent_fid = { 0 };
	366	struct dentry *dentry;
	367	int rc;
	368
	369	rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
	370	if (rc)
	371	return ERR_PTR(rc);
	372
	373	dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
	374
	375	return dentry;
d7e09d03 PT	376	}
d7e09d03 PT	377
98aa7661	378	const struct export_operations lustre_export_operations = {
22ea97f0 OD	379	.get_parent = ll_get_parent,
	380	.encode_fh = ll_encode_fh,
	381	.get_name = ll_get_name,
d7e09d03 PT	382	.fh_to_dentry = ll_fh_to_dentry,
	383	.fh_to_parent = ll_fh_to_parent,
	384	};